Johnson Controls TEC2104-3 Installation Instructions Manual page 3

Wiring
When an existing thermostat is replaced, remove and
label the wires to identify the terminal functions. When
a TEC2104-3 Thermostat is replaced, simply remove
the old screw terminal blocks and reinsert them onto
the PCB of the replacement thermostat.
CAUTION: Risk of Electric Shock.
! Disconnect the power supply before
making electrical connections to avoid
electric shock.
CAUTION: Risk of Property Damage.
Do not apply power to the system before
!
checking all wiring connections. Short
circuited or improperly connected wires
may result in permanent damage to the
equipment.
Terminal
Y1 Energizes on a Call for First-Stage Cooling
Y2
Energizes on a Call for Second-Stage Cooling
G Energizes Fan in Accordance with the Selected Fan Mode
RC
24 VAC from Equipment Transformer
C 24 VAC (Common) from Equipment Transformer
RH
24 VAC for Heating Stages
W1 Energizes on a Call for First-Stage Heating
W2 Energizes on a Call for Second-Stage Heating
Aux Auxiliary Output
DI1 Configurable Digital Input 1
DI2
Configurable Digital Input 2
RS
Remote Room Sensor
Scom
Sensor Common
OS
Outdoor Air Sensor
MS
Mixed Air or Discharge Air Sensor
EC 0 to 10 VDC Economizer Actuator Output
+, -, REF
N2 Bus
G
Y2 Y1
Cool 1
Cool 2
Fan
24 VAC
Thermostat Power
TEC2104-3 N2 Networked Multi-Stage Economizer Thermostat Installation Instructions
Function
RH W1 W2
RC C
Heat 1 Heat 2
If using the same power source
for the thermostat and heating loads,
install a jumper across RC and RH.
Figure 5: Wiring the TEC2104-3 Thermostat
IMPORTANT: Make all wiring connections in
accordance with local, national, and regional
regulations. Do not exceed the electrical ratings of
the TEC2104-3 Thermostat.
To wire the thermostat:
1. Strip the ends of each wire 1/4 in. (6 mm) and
connect them to the appropriate screw terminals as
indicated in Figure 5.
2. Carefully push any excess wire back into the wall.
Seal the hole in the wall with fireproof material to
prevent drafts from affecting the ambient
temperature readings.
3. Reinsert the screw terminal blocks onto the PCB.
4. Reattach the thermostat cover to the mounting
base (top side first).
5. Use a Phillips-head screwdriver to reinstall the
security screw on the bottom of the thermostat
cover.
Five-Pole
Left Top Connector
Y2
+
1
-
Eight-Pole Bottom Connector
REF
EC
9
Independent Contact
• Lighting
• On/Off Actuation
• Exhaust Fan
Aux DI1 DI2 RS
EC
Aux
Remote
Room
Sensor
Three-Pole
Right Top
Connector
Y1 G RC C
RH W1 W2
2 3 4 5
6 7
Aux DI1 DI2 RS OS
Scom
10 11 12 13 15
14
-
+
OS
Scom
Supervisory
Controller
Mixed Air or
Outdoor
Discharge Air
Air Sensor
Sensor
8
MS
16
REF
3